Troubleshooting - TankMate WiFi Sensors

I've completed the WiFi setup, but the device turned off

On each cycle, the status LED will display a light blue colour (for around 10 seconds) while sending a reading to the cloud. It will then turn itself off. This is normal. The unit is set to wake at preset intervals to send data. (The default is every 12 hours - but this can be customised in the app under "Tank Settings".)

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Understanding Device Modes (v2 Devices)
The status LED indicates the device mode. When no LED is visible, the device is in sleep mode - press RESET to wake: